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.NET Framework Class Library

Math.Floor Method (Double)

Returns the largest integer less than or equal to the specified double-precision floating-point number.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)
Public Shared Function Floor ( _
	d As Double _
) As Double

Parameters

d
Type: System.Double

A double-precision floating-point number.

Return Value

Type: System.Double
The largest integer less than or equal to d. If d is equal to NaN, NegativeInfinity, or PositiveInfinity, that value is returned.

The behavior of this method follows IEEE Standard 754, section 4. This kind of rounding is sometimes called rounding toward negative infinity. In other words, if d is positive, any fractional component is truncated. If d is negative, the presence of any fractional component causes it to be rounded to the smaller integer. The operation of this method differs from the Ceiling method, which supports rounding toward positive infinity.

The following example illustrates the Math.Floor(Double) method and contrasts it with the Ceiling(Double) method.

Dim values() As Double = {7.03, 7.64, 0.12, -0.12, -7.1, -7.6}
Console.WriteLine("  Value          Ceiling          Floor")
Console.WriteLine()
For Each value As Double In values
   Console.WriteLine("{0,7} {1,16} {2,14}", _
                     value, Math.Ceiling(value), Math.Floor(value))
Next    
' The example displays the following output to the console: 
'         Value          Ceiling          Floor 
'        
'          7.03                8              7 
'          7.64                8              7 
'          0.12                1              0 
'         -0.12                0             -1 
'          -7.1               -7             -8 
'          -7.6               -7             -8

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.